Run results for: For Loop vs While Loop vs indexOf

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0

Browser: Firefox 121

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

For Loop for item towards beginning

240.6M/s

While Loop for item towards beginning

230.9M/s

indexOf for item towards beginning

75.1M/s

indexOf for item towards end

34.2M/s

While Loop for item towards end

30.1M/s

For Loop for item towards end

29.5M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	240,643,280 Ops/sec
While Loop for item towards beginning	230,925,184 Ops/sec
indexOf for item towards beginning	75,084,096 Ops/sec
indexOf for item towards end	34,177,788 Ops/sec
While Loop for item towards end	30,082,950 Ops/sec
For Loop for item towards end	29,545,660 Ops/sec

Script Preparation code:

var arr = ['apple', 'banana', 'cherry', 'donuts', 'eggplant', 'french fries', 'goulash', 'hamburger', 'ice cream', 'juice', 'kebab', 'lemonade', 'mango', 'nuts', 'octopus', 'parsley', 'quail egg', 'risotto', 'stew', 'tapas', 'udon', 'vanilla', 'wheat', 'xylotil', 'yogurt', 'zucchinni'];

function forLoop(array, item) {
	for (var i = 0; i < array.length; i++) {
    	if (array[i] === item) {
          return i;
        }
    }
    return -1;
}

function whileLoop(array, item) {
  	var i = 0;
	while (i < array.length) {
    	if (array[i] === item) {
        	return i;
        }
      	i += 1;
    }
    return -1;
}

function indexOfNative(array, item) {
	return array.indexOf(item);
}

Tests:

For Loop for item towards beginning
forLoop(arr, 'donuts')
While Loop for item towards beginning
whileLoop(arr, 'donuts')
indexOf for item towards beginning
indexOfNative(arr, 'donuts')
For Loop for item towards end
forLoop(arr, 'yogurt')
While Loop for item towards end
whileLoop(arr, 'yogurt')
indexOf for item towards end
indexOfNative(arr, 'yogurt')